1

The use of sewage sludge as basal dressing for vegetable cultivation

Year:
1992
Language:
english
File:
PDF, 650 KB
english, 1992
3

A paper model for a triakis icosahedron constructed in an easy way

Year:
1991
Language:
english
File:
PDF, 4.83 MB
english, 1991
12

Skeletal models for organic molecules constructed easily and inexpensively

Year:
1993
Language:
english
File:
PDF, 1.62 MB
english, 1993